I simplified my question a bit. What I have is two main tables, customer and location. The customer table uses the standard components for search, resultset and item details.
When the user selects one customer record that customer ID is used to search for locations for that customer. That search is hidden from the user and is done using the java API and the resulting record ids are set in the resultset component for location.
This far it works fine but the problem is that if the user first selects a customer with one or more locations, those are displayed correctly but if the user then selects a customer with no locations the resultset for location is not refreshed so the previous customers locations are shown.
[Customer] 1..N [Location]